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PID effect, micro-cracks, and hot spots are three important factors that can affect the performance of crystalline silicon photovoltaic modules. Among them, PID effect and hot spots usually appear after installation and operation of PV panels for a period of time. Micro-cracks are a common problem associated with solar photovoltaic modules and they are difficult to detect with the eyes. In view of these potentially hidden problems, how we identify and rectify them is important. In the last Solis Seminar, we introduced the problem of PID effect and its solutions. In this seminar, we will share with you the causes of cell micro-cracks, how to identify them and ultimately prevent them.